Advanced Polymers
Abstracts
Advanced Polymers Abstracts
captures technical information about the uses,
manufacturing, and properties of thermoset and
thermoplastic resins -- materials that compete heavily
with metals for structural applications. This database,
centralizing information on advanced plastics, is a
subset of the Engineered Materials Abstracts database.
Based on the former print journal of the same name, the
EMA database is specifically designed for libraries that
serve materials sciences researchers, engineers and
scientists.
Sources covered include over 3,000 periodicals,
conference proceedings, technical reports, trade
journal/newsletter items, patents, books, and press
releases.
Subject Coverage
Dates of Coverage
Update Frequency
Once a month.
Approximately 7,500 new records are added per year.
Size
Over 166,493 records as
of February 2007
Thesaurus
The database is indexed
using a master authority file of about 40,000
controlled-vocabulary terms. Older records in this
database were indexed using a file-specific thesaurus;
this thesaurus has now been incorporated into the
master authority file.
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Sample Record
|
TI: |
Title
Mass discrimination in the analysis of
polydisperse polymers by MALDI time-of-flight mass
spectrometry. I. Sample preparation and desorption/ionization
issues |
|
AU: |
Author
Li, L; Schriemer, DC |
|
AF: |
Affiliation
University of Alberta; University of Alberta
|
|
SO: |
Source
Analytical Chemistry (USA), vol. 69, no. 20, pp.
4169-4175, 15 Oct. 1997 |
|
NT: |
Notes
54 ref., Spectra, Graphs |
|
PB: |
Publisher
USA |
|
IS: |
ISSN
0003-2700 |
|
AB: |
Abstract
A study of the experimental effects on the
matrix-assisted laser desorption/ionization (MALDI)
time-of-flight (TOF) mass spectrometric analysis
of polydisperse polymers is presented, based on a
time-lag focusing TOF configuration. Polydisperse
polymers were simulated with the preparation of
multicomponent blends of polystyrene of narrow
polydispersity. Spectral collection was based on
one sample preparation procedure. It is shown that
many experimental parameters give rise to mass
discrimination in the signal generated from a mass
spectral analysis of polydisperse polymers.
Several issues related to sample preparation and
desorption/ionization are addressed in this work,
and the instrumental considerations such as ion
focusing, transmission, and detection are
presented in the following article in this issue.
It is demonstrated that sample preparation and
desoprtion/ionization can introduce serious mass
biasing that appears to be due to the
characteristics of the MALDI process. Experimental
procedures are discussed that allow for the
determination of this mass discrimination. Sample
preparation guidelines are suggested for the
minimization of mass discrimination. It is
stressed that, with our current understanding of
the MALDI process, great care must be exercised in
interpreting average molecular weights and
molecular weight distribution functions deduced
from the direct MALDI analysis of polydisperse
polymers. |
|
LA: |
Language
English |
|
PY: |
Publication Year
1997 |
|
PT: |
Publication Type
Journal Article |
|
DE: |
Descriptors
Journal Article; Polystyrene resins, Physical
properties; Mass spectroscopy; Lasers; Molecular
weight; Molecular weight distribution; Specimen
preparation; Accuracy; Precision |
|
CL: |
Classification
B1 Structural Analysis |
|
EM: |
Entry Month
9712 |
|
SF: |
Subfile Name
Engineered Materials Abstracts, Polymers
|
|
AN: |
Accession Number
199712-B1-P-0084 |
Field Codes
| AB = Abstract
|
ML = Material
|
| AF = Affiliation
|
NT = Notes
|
| AN = Accession
Number |
NU = Other Numbers
|
| AU = Author
|
OT = Original
Title |
| CF = Conference
|
PA = Patent
Application (Date) |
| CL =
Classification |
PB = Publisher
|
| DE = Descriptors
|
PC = Patent
Country |
| EM = Entry Month
|
PT = Publication
Type |
| IB = ISBN
|
PY = Publication
Year |
| ID = Identifier
|
SF = Subfile Name
|
| IS = ISSN
|
SO = Source
|
| LA = Language
|
TI = Title
|
| MC = Material
classification |
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